BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Schedule Of Subsidiaries) (Details) |
6 Months Ended |
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Jun. 30, 2019 | |
Related Party Transaction [Line Items] | |
Entity Address, State or Province | OH |
Northshore | |
Related Party Transaction [Line Items] | |
Entity Address, State or Province | MN |
United Taconite | |
Related Party Transaction [Line Items] | |
Entity Address, State or Province | MN |
Tilden | |
Related Party Transaction [Line Items] | |
Entity Address, State or Province | MI |
Empire | |
Related Party Transaction [Line Items] | |
Entity Address, State or Province | MI |
Metallics | |
Related Party Transaction [Line Items] | |
Entity Address, State or Province | OH |
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